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innungsapp/apps/admin/lib/tenant.ts

@@ -0,0 +1,20 @@
+import { headers } from 'next/headers'
+
+const RESERVED_SUBDOMAINS = ['www', 'app', 'admin', 'localhost', 'superadmin', 'api']
+
+export async function getTenantSlug() {
+    const host = (await headers()).get('host') || ''
+    const domainParts = host.split(':')[0].split('.')
+
+    if (
+        domainParts.length > 2 ||
+        (domainParts.length === 2 && domainParts[1] === 'localhost')
+    ) {
+        const slug = domainParts[0]
+        if (!RESERVED_SUBDOMAINS.includes(slug)) {
+            return slug
+        }
+    }
+
+    return null
+}